package com.atguigu.springcloud.controller;

import com.atguigu.springcloud.entities.CommonResult;
import com.atguigu.springcloud.entities.Payment;
import com.atguigu.springcloud.lb.LoadBalancer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
import javax.annotation.Resource;
import java.net.URI;
import java.util.List;


/**
 * @auther zzyy
 * @create 2020-02-18 17:23
 */
@RestController
@Slf4j
public class OrderController
{
    //调用的地址
    //public static final String PAYMENT_URL = "http://localhost:8001";//单个服务提供者
    public static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE";//多个的时候，调服务名称

    @Resource
    private RestTemplate restTemplate;
    //自己写的负载均衡
    @Resource
    private LoadBalancer loadBalancer;
    @Resource
    private DiscoveryClient discoveryClient;

    @GetMapping("/consumer/payment/create") //由于是客户端，发的都是@GetMapping请求
    public CommonResult<Payment> create(Payment payment)
    {
        return restTemplate.postForObject(PAYMENT_URL +"/payment/create",payment,CommonResult.class);
    }

    @GetMapping("/consumer/payment/get/{id}")
    public CommonResult<Payment> getPayment(@PathVariable("id") Long id)
    {
        return restTemplate.getForObject(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);
    }

    //getForEntity的使用  一般是想知道更详细的信息时才使用
    @GetMapping("/consumer/payment/getForEntity/{id}")
    public CommonResult<Payment> getPayment2(@PathVariable("id") Long id)
    {
        ResponseEntity<CommonResult> entity = restTemplate.getForEntity(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);
        //is2xxSuccessful()表示访问成功    返回的编码是2xx表示成功
        if(entity.getStatusCode().is2xxSuccessful()){
            return entity.getBody();//返回请求体
        }else{
            return new CommonResult<>(444,"操作失败");
        }
    }

    //自己写的负载均衡，轮询算法的测试
    @GetMapping(value = "/consumer/payment/lb")
    public String getPaymentLB()
    {
        List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE");

        if(instances == null || instances.size() <= 0)
        {
            return null;
        }

        ServiceInstance serviceInstance = loadBalancer.instances(instances);
        URI uri = serviceInstance.getUri();

        return restTemplate.getForObject(uri+"/payment/lb",String.class);

    }

    // ====================> zipkin+sleuth
    @GetMapping("/consumer/payment/zipkin")
    public String paymentZipkin()
    {
        String result = restTemplate.getForObject("http://localhost:8001"+"/payment/zipkin/", String.class);
        return result;
    }
}
